jdk8-mips64-public/hotspot: src/share/vm/ci/ciKlass.cpp@5eb9169b1a14

7092712: JSR 292: unloaded invokedynamic call sites can lead to a crash with signature types not on BCP
Reviewed-by: jrose, never

     1 /*

     2  * Copyright (c) 1999, 2011, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #include "precompiled.hpp"

    26 #include "ci/ciKlass.hpp"

    27 #include "ci/ciSymbol.hpp"

    28 #include "ci/ciUtilities.hpp"

    29 #include "oops/oop.inline.hpp"

    31 // ciKlass

    32 //

    33 // This class represents a klassOop in the HotSpot virtual

    34 // machine.

    36 // ------------------------------------------------------------------

    37 // ciKlass::ciKlass

    38 ciKlass::ciKlass(KlassHandle h_k) : ciType(h_k) {

    39   assert(get_oop()->is_klass(), "wrong type");

    40   Klass* k = get_Klass();

    41   _layout_helper = k->layout_helper();

    42   Symbol* klass_name = k->name();

    43   assert(klass_name != NULL, "wrong ciKlass constructor");

    44   _name = CURRENT_ENV->get_symbol(klass_name);

    45 }

    47 // ------------------------------------------------------------------

    48 // ciKlass::ciKlass

    49 //

    50 // Nameless klass variant.

    51 ciKlass::ciKlass(KlassHandle h_k, ciSymbol* name) : ciType(h_k) {

    52   assert(get_oop()->is_klass(), "wrong type");

    53   _name = name;

    54   _layout_helper = Klass::_lh_neutral_value;

    55 }

    57 // ------------------------------------------------------------------

    58 // ciKlass::ciKlass

    59 //

    60 // Unloaded klass variant.

    61 ciKlass::ciKlass(ciSymbol* name, ciKlass* klass) : ciType(klass) {

    62   _name = name;

    63   _layout_helper = Klass::_lh_neutral_value;

    64 }

    66 // ------------------------------------------------------------------

    67 // ciKlass::is_subtype_of

    68 bool ciKlass::is_subtype_of(ciKlass* that) {

    69   assert(is_loaded() && that->is_loaded(), "must be loaded");

    70   assert(is_java_klass() && that->is_java_klass(), "must be java klasses");

    71   // Check to see if the klasses are identical.

    72   if (this == that) {

    73     return true;

    74   }

    76   VM_ENTRY_MARK;

    77   Klass* this_klass = get_Klass();

    78   klassOop that_klass = that->get_klassOop();

    79   bool result = this_klass->is_subtype_of(that_klass);

    81   return result;

    82 }

    84 // ------------------------------------------------------------------

    85 // ciKlass::is_subclass_of

    86 bool ciKlass::is_subclass_of(ciKlass* that) {

    87   assert(is_loaded() && that->is_loaded(), "must be loaded");

    88   assert(is_java_klass() && that->is_java_klass(), "must be java klasses");

    89   // Check to see if the klasses are identical.

    91   VM_ENTRY_MARK;

    92   Klass* this_klass = get_Klass();

    93   klassOop that_klass = that->get_klassOop();

    94   bool result = this_klass->is_subclass_of(that_klass);

    96   return result;

    97 }

    99 // ------------------------------------------------------------------

   100 // ciKlass::super_depth

   101 juint ciKlass::super_depth() {

   102   assert(is_loaded(), "must be loaded");

   103   assert(is_java_klass(), "must be java klasses");

   105   VM_ENTRY_MARK;

   106   Klass* this_klass = get_Klass();

   107   return this_klass->super_depth();

   108 }

   110 // ------------------------------------------------------------------

   111 // ciKlass::super_check_offset

   112 juint ciKlass::super_check_offset() {

   113   assert(is_loaded(), "must be loaded");

   114   assert(is_java_klass(), "must be java klasses");

   116   VM_ENTRY_MARK;

   117   Klass* this_klass = get_Klass();

   118   return this_klass->super_check_offset();

   119 }

   121 // ------------------------------------------------------------------

   122 // ciKlass::super_of_depth

   123 ciKlass* ciKlass::super_of_depth(juint i) {

   124   assert(is_loaded(), "must be loaded");

   125   assert(is_java_klass(), "must be java klasses");

   127   VM_ENTRY_MARK;

   128   Klass* this_klass = get_Klass();

   129   klassOop super = this_klass->primary_super_of_depth(i);

   130   return (super != NULL) ? CURRENT_THREAD_ENV->get_object(super)->as_klass() : NULL;

   131 }

   133 // ------------------------------------------------------------------

   134 // ciKlass::can_be_primary_super

   135 bool ciKlass::can_be_primary_super() {

   136   assert(is_loaded(), "must be loaded");

   137   assert(is_java_klass(), "must be java klasses");

   139   VM_ENTRY_MARK;

   140   Klass* this_klass = get_Klass();

   141   return this_klass->can_be_primary_super();

   142 }

   144 // ------------------------------------------------------------------

   145 // ciKlass::least_common_ancestor

   146 //

   147 // Get the shared parent of two klasses.

   148 //

   149 // Implementation note: this method currently goes "over the wall"

   150 // and does all of the work on the VM side.  It could be rewritten

   151 // to use the super() method and do all of the work (aside from the

   152 // lazy computation of super()) in native mode.  This may be

   153 // worthwhile if the compiler is repeatedly requesting the same lca

   154 // computation or possibly if most of the superklasses have already

   155 // been created as ciObjects anyway.  Something to think about...

   156 ciKlass*

   157 ciKlass::least_common_ancestor(ciKlass* that) {

   158   assert(is_loaded() && that->is_loaded(), "must be loaded");

   159   assert(is_java_klass() && that->is_java_klass(), "must be java klasses");

   160   // Check to see if the klasses are identical.

   161   if (this == that) {

   162     return this;

   163   }

   165   VM_ENTRY_MARK;

   166   Klass* this_klass = get_Klass();

   167   Klass* that_klass = that->get_Klass();

   168   Klass* lca        = this_klass->LCA(that_klass);

   170   // Many times the LCA will be either this_klass or that_klass.

   171   // Treat these as special cases.

   172   if (lca == that_klass) {

   173     return that;

   174   }

   175   if (this_klass == lca) {

   176     return this;

   177   }

   179   // Create the ciInstanceKlass for the lca.

   180   ciKlass* result =

   181     CURRENT_THREAD_ENV->get_object(lca->as_klassOop())->as_klass();

   183   return result;

   184 }

   186 // ------------------------------------------------------------------

   187 // ciKlass::find_klass

   188 //

   189 // Find a klass using this klass's class loader.

   190 ciKlass* ciKlass::find_klass(ciSymbol* klass_name) {

   191   assert(is_loaded(), "cannot find_klass through an unloaded klass");

   192   return CURRENT_ENV->get_klass_by_name(this,

   193                                         klass_name, false);

   194 }

   196 // ------------------------------------------------------------------

   197 // ciKlass::java_mirror

   198 //

   199 // Get the instance of java.lang.Class corresponding to this klass.

   200 // If it is an unloaded instance or array klass, return an unloaded

   201 // mirror object of type Class.

   202 ciInstance* ciKlass::java_mirror() {

   203   GUARDED_VM_ENTRY(

   204     if (!is_loaded())

   205       return ciEnv::current()->get_unloaded_klass_mirror(this);

   206     oop java_mirror = get_Klass()->java_mirror();

   207     return CURRENT_ENV->get_object(java_mirror)->as_instance();

   208   )

   209 }

   211 // ------------------------------------------------------------------

   212 // ciKlass::modifier_flags

   213 jint ciKlass::modifier_flags() {

   214   assert(is_loaded(), "not loaded");

   215   GUARDED_VM_ENTRY(

   216     return get_Klass()->modifier_flags();

   217   )

   218 }

   220 // ------------------------------------------------------------------

   221 // ciKlass::access_flags

   222 jint ciKlass::access_flags() {

   223   assert(is_loaded(), "not loaded");

   224   GUARDED_VM_ENTRY(

   225     return get_Klass()->access_flags().as_int();

   226   )

   227 }

   229 // ------------------------------------------------------------------

   230 // ciKlass::print_impl

   231 //

   232 // Implementation of the print method

   233 void ciKlass::print_impl(outputStream* st) {

   234   st->print(" name=");

   235   print_name_on(st);

   236 }

   238 // ------------------------------------------------------------------

   239 // ciKlass::print_name

   240 //

   241 // Print the name of this klass

   242 void ciKlass::print_name_on(outputStream* st) {

   243   name()->print_symbol_on(st);

   244 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/ci/ciKlass.cpp@5eb9169b1a14

src/share/vm/ci/ciKlass.cpp